Which marketing philosophy/concept expresses the idea that consumers will not buy enough of the firm’s product, unless it undertakes a large-scale selling and promotion effort?

The Selling Concept.

Explanation:

Marketing philosophy/concept expresses the idea that consumers will not buy enough of the firm’s product, unless it undertakes a large-scale selling and promotion effort falls under the selling concept. This logic emerged at the beginning of the 20th century and followed by the 2nd world war. This philosophy is mainly used and applied on the products which are not bought and purchased by the consumers, therefore, selling efforts are required in order to sale them for example, mostly unsought goods such as blood donations, cancer donations and insurance products. Firms also uses this idea when they have the face overcapacity where their objective is to sell whatever they have not what exactly market and customers want.